kernel BUG at mm/khugepaged.c:469! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 6878 Comm: syz-executor328 Not tainted 5.8.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__khugepaged_enter+0x306/0x3d0 mm/khugepaged.c:469 Code: e4 49 81 fe 00 b0 c9 89 74 2a e8 45 79 bb ff 44 89 e0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 e8 32 79 bb ff 48 89 ef e8 1a d6 e9 ff <0f> 0b 41 bc f4 ff ff ff eb d6 e8 1b 79 bb ff 31 c9 ba 01 00 00 00 RSP: 0018:ffffc90005687a70 EFLAGS: 00010282 RAX: 0000000000000363 RBX: 0000000000000003 RCX: 0000000000000000 RDX: ffff888093d6e0c0 RSI: ffffffff815dbc57 RDI: fffff52000ad0eed RBP: ffff88808fe8aa80 R08: 0000000000000363 R09: ffff8880ae7318e7 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888092fd8000 R13: ffff88808fe8aadc R14: 0000000020000000 R15: ffffc90005687ba8 FS: 00007fb1982f9700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff1599c300 CR3: 00000000a7374000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: khugepaged_enter include/linux/khugepaged.h:62 [inline] do_huge_pmd_anonymous_page+0xaa1/0x2230 mm/huge_memory.c:706 create_huge_pmd mm/memory.c:4106 [inline] __handle_mm_fault mm/memory.c:4327 [inline] handle_mm_fault+0x369d/0x4590 mm/memory.c:4454 do_user_addr_fault+0x598/0xbf0 arch/x86/mm/fault.c:1294 handle_page_fault arch/x86/mm/fault.c:1351 [inline] exc_page_fault+0xa8/0x160 arch/x86/mm/fault.c:1404 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:538 RIP: 0010:copy_user_enhanced_fast_string+0xe/0x30 arch/x86/lib/copy_user_64.S:205 Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 1f 00 c3 0f 1f 80 00 00 00 00 0f 1f 00 83 fa 40 0f 82 70 ff ff ff 89 d1 a4 31 c0 0f 1f 00 c3 66 2e 0f 1f 84 00 00 00 00 00 89 d1 f3 a4 RSP: 0018:ffffc90005687db0 EFLAGS: 00010206 RAX: 0000000000000001 RBX: 0000000020000000 RCX: 0000000000000052 RDX: 0000000000000052 RSI: ffff8880a2714800 RDI: 0000000020000000 RBP: ffff8880a2714800 R08: 0000000000000000 R09: ffff8880a2714851 R10: ffffed10144e290a R11: 0000000000000000 R12: 0000000000000052 R13: 0000000020000052 R14: 00007ffffffff000 R15: 0000000000000000 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:74 [inline] _copy_to_user+0x11e/0x160 lib/usercopy.c:30 copy_to_user include/linux/uaccess.h:168 [inline] syslog_print_all kernel/printk/printk.c:1508 [inline] do_syslog.part.0+0xf85/0x16c0 kernel/printk/printk.c:1579 do_syslog kernel/printk/printk.c:1654 [inline] __do_sys_syslog kernel/printk/printk.c:1656 [inline] __se_sys_syslog kernel/printk/printk.c:1654 [inline] __x64_sys_syslog+0x97/0xc0 kernel/printk/printk.c:1654 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4467d9 Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db 06 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fb1982f8db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000067 RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 00000000004467d9 RDX: 00000000000000ce RSI: 0000000020000000 RDI: 0000000000000003 RBP: 00000000006dbc20 R08: 00007fb1982f9700 R09: 0000000000000000 R10: 00007fb1982f9700 R11: 0000000000000246 R12: 00000000006dbc2c R13: 00007fff1599c27f R14: 00007fb1982f99c0 R15: 000000000000002d Modules linked in: ---[ end trace 1d974ccb4ce2a51b ]--- RIP: 0010:__khugepaged_enter+0x306/0x3d0 mm/khugepaged.c:469 Code: e4 49 81 fe 00 b0 c9 89 74 2a e8 45 79 bb ff 44 89 e0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 e8 32 79 bb ff 48 89 ef e8 1a d6 e9 ff <0f> 0b 41 bc f4 ff ff ff eb d6 e8 1b 79 bb ff 31 c9 ba 01 00 00 00 RSP: 0018:ffffc90005687a70 EFLAGS: 00010282 RAX: 0000000000000363 RBX: 0000000000000003 RCX: 0000000000000000 RDX: ffff888093d6e0c0 RSI: ffffffff815dbc57 RDI: fffff52000ad0eed RBP: ffff88808fe8aa80 R08: 0000000000000363 R09: ffff8880ae7318e7 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888092fd8000 R13: ffff88808fe8aadc R14: 0000000020000000 R15: ffffc90005687ba8 FS: 00007fb1982f9700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb1982f8e78 CR3: 00000000a7374000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400